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-rw-r--r--include/net/udp_tunnel.h370
1 files changed, 370 insertions, 0 deletions
diff --git a/include/net/udp_tunnel.h b/include/net/udp_tunnel.h
new file mode 100644
index 000000000..24ece06ba
--- /dev/null
+++ b/include/net/udp_tunnel.h
@@ -0,0 +1,370 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __NET_UDP_TUNNEL_H
+#define __NET_UDP_TUNNEL_H
+
+#include <net/ip_tunnels.h>
+#include <net/udp.h>
+
+#if IS_ENABLED(CONFIG_IPV6)
+#include <net/ipv6.h>
+#include <net/ipv6_stubs.h>
+#endif
+
+struct udp_port_cfg {
+ u8 family;
+
+ /* Used only for kernel-created sockets */
+ union {
+ struct in_addr local_ip;
+#if IS_ENABLED(CONFIG_IPV6)
+ struct in6_addr local_ip6;
+#endif
+ };
+
+ union {
+ struct in_addr peer_ip;
+#if IS_ENABLED(CONFIG_IPV6)
+ struct in6_addr peer_ip6;
+#endif
+ };
+
+ __be16 local_udp_port;
+ __be16 peer_udp_port;
+ int bind_ifindex;
+ unsigned int use_udp_checksums:1,
+ use_udp6_tx_checksums:1,
+ use_udp6_rx_checksums:1,
+ ipv6_v6only:1;
+};
+
+int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
+ struct socket **sockp);
+
+#if IS_ENABLED(CONFIG_IPV6)
+int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
+ struct socket **sockp);
+#else
+static inline int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
+ struct socket **sockp)
+{
+ return 0;
+}
+#endif
+
+static inline int udp_sock_create(struct net *net,
+ struct udp_port_cfg *cfg,
+ struct socket **sockp)
+{
+ if (cfg->family == AF_INET)
+ return udp_sock_create4(net, cfg, sockp);
+
+ if (cfg->family == AF_INET6)
+ return udp_sock_create6(net, cfg, sockp);
+
+ return -EPFNOSUPPORT;
+}
+
+typedef int (*udp_tunnel_encap_rcv_t)(struct sock *sk, struct sk_buff *skb);
+typedef int (*udp_tunnel_encap_err_lookup_t)(struct sock *sk,
+ struct sk_buff *skb);
+typedef void (*udp_tunnel_encap_destroy_t)(struct sock *sk);
+typedef struct sk_buff *(*udp_tunnel_gro_receive_t)(struct sock *sk,
+ struct list_head *head,
+ struct sk_buff *skb);
+typedef int (*udp_tunnel_gro_complete_t)(struct sock *sk, struct sk_buff *skb,
+ int nhoff);
+
+struct udp_tunnel_sock_cfg {
+ void *sk_user_data; /* user data used by encap_rcv call back */
+ /* Used for setting up udp_sock fields, see udp.h for details */
+ __u8 encap_type;
+ udp_tunnel_encap_rcv_t encap_rcv;
+ udp_tunnel_encap_err_lookup_t encap_err_lookup;
+ udp_tunnel_encap_destroy_t encap_destroy;
+ udp_tunnel_gro_receive_t gro_receive;
+ udp_tunnel_gro_complete_t gro_complete;
+};
+
+/* Setup the given (UDP) sock to receive UDP encapsulated packets */
+void setup_udp_tunnel_sock(struct net *net, struct socket *sock,
+ struct udp_tunnel_sock_cfg *sock_cfg);
+
+/* -- List of parsable UDP tunnel types --
+ *
+ * Adding to this list will result in serious debate. The main issue is
+ * that this list is essentially a list of workarounds for either poorly
+ * designed tunnels, or poorly designed device offloads.
+ *
+ * The parsing supported via these types should really be used for Rx
+ * traffic only as the network stack will have already inserted offsets for
+ * the location of the headers in the skb. In addition any ports that are
+ * pushed should be kept within the namespace without leaking to other
+ * devices such as VFs or other ports on the same device.
+ *
+ * It is strongly encouraged to use CHECKSUM_COMPLETE for Rx to avoid the
+ * need to use this for Rx checksum offload. It should not be necessary to
+ * call this function to perform Tx offloads on outgoing traffic.
+ */
+enum udp_parsable_tunnel_type {
+ UDP_TUNNEL_TYPE_VXLAN = BIT(0), /* RFC 7348 */
+ UDP_TUNNEL_TYPE_GENEVE = BIT(1), /* draft-ietf-nvo3-geneve */
+ UDP_TUNNEL_TYPE_VXLAN_GPE = BIT(2), /* draft-ietf-nvo3-vxlan-gpe */
+};
+
+struct udp_tunnel_info {
+ unsigned short type;
+ sa_family_t sa_family;
+ __be16 port;
+ u8 hw_priv;
+};
+
+/* Notify network devices of offloadable types */
+void udp_tunnel_push_rx_port(struct net_device *dev, struct socket *sock,
+ unsigned short type);
+void udp_tunnel_drop_rx_port(struct net_device *dev, struct socket *sock,
+ unsigned short type);
+void udp_tunnel_notify_add_rx_port(struct socket *sock, unsigned short type);
+void udp_tunnel_notify_del_rx_port(struct socket *sock, unsigned short type);
+
+static inline void udp_tunnel_get_rx_info(struct net_device *dev)
+{
+ ASSERT_RTNL();
+ call_netdevice_notifiers(NETDEV_UDP_TUNNEL_PUSH_INFO, dev);
+}
+
+static inline void udp_tunnel_drop_rx_info(struct net_device *dev)
+{
+ ASSERT_RTNL();
+ call_netdevice_notifiers(NETDEV_UDP_TUNNEL_DROP_INFO, dev);
+}
+
+/* Transmit the skb using UDP encapsulation. */
+void udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
+ __be32 src, __be32 dst, __u8 tos, __u8 ttl,
+ __be16 df, __be16 src_port, __be16 dst_port,
+ bool xnet, bool nocheck);
+
+int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk,
+ struct sk_buff *skb,
+ struct net_device *dev, struct in6_addr *saddr,
+ struct in6_addr *daddr,
+ __u8 prio, __u8 ttl, __be32 label,
+ __be16 src_port, __be16 dst_port, bool nocheck);
+
+void udp_tunnel_sock_release(struct socket *sock);
+
+struct metadata_dst *udp_tun_rx_dst(struct sk_buff *skb, unsigned short family,
+ __be16 flags, __be64 tunnel_id,
+ int md_size);
+
+#ifdef CONFIG_INET
+static inline int udp_tunnel_handle_offloads(struct sk_buff *skb, bool udp_csum)
+{
+ int type = udp_csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
+
+ return iptunnel_handle_offloads(skb, type);
+}
+#endif
+
+static inline void udp_tunnel_encap_enable(struct socket *sock)
+{
+ struct udp_sock *up = udp_sk(sock->sk);
+
+ if (up->encap_enabled)
+ return;
+
+ up->encap_enabled = 1;
+#if IS_ENABLED(CONFIG_IPV6)
+ if (sock->sk->sk_family == PF_INET6)
+ ipv6_stub->udpv6_encap_enable();
+#endif
+ udp_encap_enable();
+}
+
+#define UDP_TUNNEL_NIC_MAX_TABLES 4
+
+enum udp_tunnel_nic_info_flags {
+ /* Device callbacks may sleep */
+ UDP_TUNNEL_NIC_INFO_MAY_SLEEP = BIT(0),
+ /* Device only supports offloads when it's open, all ports
+ * will be removed before close and re-added after open.
+ */
+ UDP_TUNNEL_NIC_INFO_OPEN_ONLY = BIT(1),
+ /* Device supports only IPv4 tunnels */
+ UDP_TUNNEL_NIC_INFO_IPV4_ONLY = BIT(2),
+ /* Device has hard-coded the IANA VXLAN port (4789) as VXLAN.
+ * This port must not be counted towards n_entries of any table.
+ * Driver will not receive any callback associated with port 4789.
+ */
+ UDP_TUNNEL_NIC_INFO_STATIC_IANA_VXLAN = BIT(3),
+};
+
+struct udp_tunnel_nic;
+
+#define UDP_TUNNEL_NIC_MAX_SHARING_DEVICES (U16_MAX / 2)
+
+struct udp_tunnel_nic_shared {
+ struct udp_tunnel_nic *udp_tunnel_nic_info;
+
+ struct list_head devices;
+};
+
+struct udp_tunnel_nic_shared_node {
+ struct net_device *dev;
+ struct list_head list;
+};
+
+/**
+ * struct udp_tunnel_nic_info - driver UDP tunnel offload information
+ * @set_port: callback for adding a new port
+ * @unset_port: callback for removing a port
+ * @sync_table: callback for syncing the entire port table at once
+ * @shared: reference to device global state (optional)
+ * @flags: device flags from enum udp_tunnel_nic_info_flags
+ * @tables: UDP port tables this device has
+ * @tables.n_entries: number of entries in this table
+ * @tables.tunnel_types: types of tunnels this table accepts
+ *
+ * Drivers are expected to provide either @set_port and @unset_port callbacks
+ * or the @sync_table callback. Callbacks are invoked with rtnl lock held.
+ *
+ * Devices which (misguidedly) share the UDP tunnel port table across multiple
+ * netdevs should allocate an instance of struct udp_tunnel_nic_shared and
+ * point @shared at it.
+ * There must never be more than %UDP_TUNNEL_NIC_MAX_SHARING_DEVICES devices
+ * sharing a table.
+ *
+ * Known limitations:
+ * - UDP tunnel port notifications are fundamentally best-effort -
+ * it is likely the driver will both see skbs which use a UDP tunnel port,
+ * while not being a tunneled skb, and tunnel skbs from other ports -
+ * drivers should only use these ports for non-critical RX-side offloads,
+ * e.g. the checksum offload;
+ * - none of the devices care about the socket family at present, so we don't
+ * track it. Please extend this code if you care.
+ */
+struct udp_tunnel_nic_info {
+ /* one-by-one */
+ int (*set_port)(struct net_device *dev,
+ unsigned int table, unsigned int entry,
+ struct udp_tunnel_info *ti);
+ int (*unset_port)(struct net_device *dev,
+ unsigned int table, unsigned int entry,
+ struct udp_tunnel_info *ti);
+
+ /* all at once */
+ int (*sync_table)(struct net_device *dev, unsigned int table);
+
+ struct udp_tunnel_nic_shared *shared;
+
+ unsigned int flags;
+
+ struct udp_tunnel_nic_table_info {
+ unsigned int n_entries;
+ unsigned int tunnel_types;
+ } tables[UDP_TUNNEL_NIC_MAX_TABLES];
+};
+
+/* UDP tunnel module dependencies
+ *
+ * Tunnel drivers are expected to have a hard dependency on the udp_tunnel
+ * module. NIC drivers are not, they just attach their
+ * struct udp_tunnel_nic_info to the netdev and wait for callbacks to come.
+ * Loading a tunnel driver will cause the udp_tunnel module to be loaded
+ * and only then will all the required state structures be allocated.
+ * Since we want a weak dependency from the drivers and the core to udp_tunnel
+ * we call things through the following stubs.
+ */
+struct udp_tunnel_nic_ops {
+ void (*get_port)(struct net_device *dev, unsigned int table,
+ unsigned int idx, struct udp_tunnel_info *ti);
+ void (*set_port_priv)(struct net_device *dev, unsigned int table,
+ unsigned int idx, u8 priv);
+ void (*add_port)(struct net_device *dev, struct udp_tunnel_info *ti);
+ void (*del_port)(struct net_device *dev, struct udp_tunnel_info *ti);
+ void (*reset_ntf)(struct net_device *dev);
+
+ size_t (*dump_size)(struct net_device *dev, unsigned int table);
+ int (*dump_write)(struct net_device *dev, unsigned int table,
+ struct sk_buff *skb);
+};
+
+#ifdef CONFIG_INET
+extern const struct udp_tunnel_nic_ops *udp_tunnel_nic_ops;
+#else
+#define udp_tunnel_nic_ops ((struct udp_tunnel_nic_ops *)NULL)
+#endif
+
+static inline void
+udp_tunnel_nic_get_port(struct net_device *dev, unsigned int table,
+ unsigned int idx, struct udp_tunnel_info *ti)
+{
+ /* This helper is used from .sync_table, we indicate empty entries
+ * by zero'ed @ti. Drivers which need to know the details of a port
+ * when it gets deleted should use the .set_port / .unset_port
+ * callbacks.
+ * Zero out here, otherwise !CONFIG_INET causes uninitilized warnings.
+ */
+ memset(ti, 0, sizeof(*ti));
+
+ if (udp_tunnel_nic_ops)
+ udp_tunnel_nic_ops->get_port(dev, table, idx, ti);
+}
+
+static inline void
+udp_tunnel_nic_set_port_priv(struct net_device *dev, unsigned int table,
+ unsigned int idx, u8 priv)
+{
+ if (udp_tunnel_nic_ops)
+ udp_tunnel_nic_ops->set_port_priv(dev, table, idx, priv);
+}
+
+static inline void
+udp_tunnel_nic_add_port(struct net_device *dev, struct udp_tunnel_info *ti)
+{
+ if (udp_tunnel_nic_ops)
+ udp_tunnel_nic_ops->add_port(dev, ti);
+}
+
+static inline void
+udp_tunnel_nic_del_port(struct net_device *dev, struct udp_tunnel_info *ti)
+{
+ if (udp_tunnel_nic_ops)
+ udp_tunnel_nic_ops->del_port(dev, ti);
+}
+
+/**
+ * udp_tunnel_nic_reset_ntf() - device-originating reset notification
+ * @dev: network interface device structure
+ *
+ * Called by the driver to inform the core that the entire UDP tunnel port
+ * state has been lost, usually due to device reset. Core will assume device
+ * forgot all the ports and issue .set_port and .sync_table callbacks as
+ * necessary.
+ *
+ * This function must be called with rtnl lock held, and will issue all
+ * the callbacks before returning.
+ */
+static inline void udp_tunnel_nic_reset_ntf(struct net_device *dev)
+{
+ if (udp_tunnel_nic_ops)
+ udp_tunnel_nic_ops->reset_ntf(dev);
+}
+
+static inline size_t
+udp_tunnel_nic_dump_size(struct net_device *dev, unsigned int table)
+{
+ if (!udp_tunnel_nic_ops)
+ return 0;
+ return udp_tunnel_nic_ops->dump_size(dev, table);
+}
+
+static inline int
+udp_tunnel_nic_dump_write(struct net_device *dev, unsigned int table,
+ struct sk_buff *skb)
+{
+ if (!udp_tunnel_nic_ops)
+ return 0;
+ return udp_tunnel_nic_ops->dump_write(dev, table, skb);
+}
+#endif